Rotary cutter.



No. 634,2". Patentedct. 3, |899.

G. D. GILLETTE.

BDT'ARY CUTTER.

(Application med June 23, 189e.)

No Model.) 2 Sheets-Sheet l,

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(N0 Model.)

UNITED STATES PATENT' EETOE.

GEORGE D. GILLETTE, OE OswEeo, NEW YORK, AssIGNOE To D. H. BUE- EELL a Oo., OE LITTLE EALLs, NEw YORK.

ROTARY CUTTER.

SPECIFICATION forming part of Letters Patent No. 634,211, dated' October 3, 1899.

Applicatiouled .T une 23 1896.

T0 ctZZ whom it' may concern:

Be it known that I, GEORGE D. GILLETTE, a citizen of the United States, residing at Oswego, in the county of Oswego and State of New York, have invented new and useful Improvements in Rotary Gutters for Woodworking, of which the following is a specification.

Thisinvention relates to that class of rotary cutters which are employed for cutting grooves in a board or plank, leaving the wood.

between the grooves in the form of slats, bars, or rods. A

The object of this invention is morev particularly to produce a cutter by which curtain-slats with smoothly-finished surfaces can be quickly and economically produced from boards or strips of wood without causing heating of the cutter by friction or binding and which cutter has its cutting edges so arranged that they can be readily ground or sharpened without altering the form of the cut.

In the accompanying drawings, consisting of two sheets, Figure l is a side elevation of one of my improved cutters. Fig. 2 is a front elevation thereof. Fig. 3 is a top plan view thereof. Fig. 4 is a perspective View thereof. Fig. 5 is a front elevation showing three of these cutters mounted upon the same mandrel with two intermediate or connecting cutters. Fig. 6 is a side elevation of one of the main cutters and one of the intermediate cutters. Fig. 7 is a section through the intermediate cutter in line 7 7, Fig. 6. Fig. 8 is a rear elevation of the intermediate cutter. Fig. 9 is a side elevation showing two of the main cutters and the intermediate cutter. Fig. l0 is a diagram illustrating two succeeding teeth in section, the section being taken on a circular line, as lO 10, Fig. l.

Like letters of reference refer to like parts in the several figures.

A represents the body or hub portion of the cutter-head or main cutter, provided'with a central transverse opening a, through which the mandrel or shaft passes in the usual manner and on diametrically opposite sides of the mandrel-opening, with two wings A', in which the cutting edges are formed. Each wing is formed with an oblique front face h,

Serial No. 596,575. (No model.)

inclining transversely from the front edge b', the two front faces of the two wings being beveled or inclined in Opposite directions, as clearly shown in Fig. l, so as to have their front cutting edges b on opposite sides of the cutter-head and the outer cutting edge b2 eX- tending rearwardly and transversely from the outer front corner of the front face, but at the same radial distance from the axis of the cutter-head to the Outer corner of the rear or trailing edge b3 of the Oblique front y face b. The outer portion of each wing is divided intoseveral cutting-teeth C, which are arranged side by side and separated by grooves C. The sides c of these teeth are plane and incline slightly in an outward direction or from the base of each tooth to the outer end c' thereof. The bases of adjoining teeth are connected by concave or rounded bottom portions c2. The outer ends c' of the teeth in each wing are preferably straight and arranged about at right angles to a radial line drawn through the wing about midwaybetweenv its front and rear sides. The front face of each wingrecedes inwardly from its outer edge and is preferably connected with the hub portion of the cutter-head by a curved portion d. The rear corner portion of each wing is preferably out away obliquely, as shown at c, in order to give the wing ample clearance.

The cutter rotates in the direction of the arrows, Figs. l and 3, and that portion of each tooth which stands at an acute angle to the front face of the wing effects a sharp and clean cut, so that the teeth in one wing cut one half of eachgroove and the teeth in the other wing, which is oppositely beveled, cut the other half of each groove. As each point of the teeth of the cutter moves in a circular line concentric with the axis ofthe cutter and the sides of each tooth are formed with plane bevels converging outwardly, the sides of each tooth recede from the sides `of, the groove which is being cut from the cutting-face of each tooth rearwardly, as indicated by the diagram Fig. l0. This causes the teeth to clear themselves nicely from the wood in outting and prevents heating and binding. The cutting edges are all located in the oblique front face of each wing, so that the cutter is lOO readily sharpened by simply grindingl the front face of each wing. The wood which is left standing between the grooves formed by the cutting-teeth has the form of ordinary curtain-slats-that is to say, of bars having slightly-converging plane sides connected by a rounded portion at the thin edge. Vhen several ot these cutters are arranged upon the same mandrel, side by side, they are preferably arranged so far apart, as shown in Fig. 5, that the adjacent outer teeth of two cutter-heads or main cutters are separated by a space which will form a Slat, and a thin joining or connecting cutter F is arranged between the two main cutters for cutting the rounded connecting portion of the groove between the two main cutters. This connecting-cutter consists of a plate of the proper thickness, having its two outer edges f hollowed ont on opposite sides, as shown, a thin portion f of the fiat edge being left standing to supply the necessary strength and stiffness. The front corner of each outer edge is provided with an oblique front face g, the two faces' being beveled transversely in opposite directions, so that the curved edges of these front faces will cnt alternately onehalt of the rounded connecting portion of the groove.

rlhe main cutters are provided in their sides with recesses 7L,in which the intermediate cu tters are arranged, and these recesses are preferably arranged at different angles on opposite sides of the same main cutter, so that the several main cutters will not stand in line along the mandrel, but will break joint or follow each other eircumferentially around the mandrel, as indicated in Fig. 9.

I claim as my inventionl. A rotary cutter for woodwork ha ving projecting wings which have their front faces inclined transversely and alternately in opposite directions in the several wings and eutting-teeth arranged side by side in the outer portions of each wing, which teeth have plane outwardly-inclined sides, substantially as set forth.

2. A rotary cutter for woodwork having projccting wings which have their front faces inclined transversely and alternately in opposite directions in the several wings, each wing having 'the outer edge of its oblique front face equidistant from end to end from the axis of the cutter and cutting-teeth arranged side by side in the outer portion of each Wing, which teeth have plane outwardly-inclined sides and rounded bottom portions connecting the bases of adjacent teeth, substantially as set forth.

3. The combination with two rotary cutters each having projecting wings which have their front faces inclined transversely and alternately in opposite directions in the wings of each cutter, each wing having cuttingteeth arranged side by side in its outer portion, which teeth have plane outwardly-inclined sides and rounded bottom portions connecting the bases of adjacent teeth, of an intermediate cutter having its outer portion concaved alternately on opposite sides and provided at the front corner of each outer portion with a transversely-inclined front face, said front faces being inclined alternately in opposite directions,substantially as Set forth.

Vitness my hand this 12th day of May, 1806.

GEORGE D. GILLETTE. \Vitncsses:

NATHANIEL STONE, WILFORD LA SME. 

